A massive German army is poised to annihilate the Duke of Lorraine. The Duke is badly outnumbered, but he has a second army ready to strike the unsuspecting Germans from the rear. Will the element of surprise be enough, or will the House of Lorraine's millennia-old ambitions of world domination come to an untimely end?

Meanwhile, Julien has escaped from the Inquisition, only to find himself at the mercy of Lorraine's dreaded Imperial Guard. He travels deep into the heart of the remote Pyrenees Mountains, where he will uncover the deepest secrets of the Holy Grail. The Grail has been Julien's driving obsession since he began his investigation, and he might regret being so persistent when he learns the truth!